JPH097844A - Composite component and dc-dc converter using that - Google Patents

Abstract

PURPOSE: To provide a composite component of a structure, wherein a coil component, which is used for a transformer or the like, can be automatically mounted on a substrate and moreover, a decrease in height can be realized. CONSTITUTION: A composite component 10 is formed by mounting a coil component 14 on a substrate 11. A recessed part 15 is provided in the rectangular parallelepiped-shaped substrate 11, which consists of a magnetic material, as an engaging means for engaging the coil component 14 formed by winding a copper wire, which has a fusing property insulating film, on a core 12 consisting of a magnetic material and moreover, a transistor, etc., and a resistor, which are required for making the component 10 have a DC-DC conversion function, are mounted and printed on the surface of the substrate 11. On the other hand, flanges 16a and 16b are respectively provided on both end parts of a rod-type winding part 121 of the core 12 constituting the component 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil component, particularly a composite component in which the coil component is applied to a transformer, and a DC-DC converter using the same.

[0002]

2. Description of the Related Art A conventional composite part is shown in FIG. In the composite component 50, a coil component 53 formed by winding a winding wire 54 around a core 55 is horizontally placed in a cutout 52 provided at an end of a substrate 51, that is, the core 55 is horizontal to the substrate 51. Mounted as a substrate 51
On the other hand, the collars 56a and 5a provided on both ends of the core 55
6b was fixed with solders 57a and 57b.

[0003]

However, in the above-mentioned conventional composite component 50, the coil component 53 is mounted horizontally, so that the handling by the automatic mounting machine,
That is, it was difficult to automatically mount.

Further, in order to reduce the height of the composite component 50, it is necessary to make the core 55 thin and lengthen the core 55 accordingly, but when the coil component 53 is used as a transformer, magnetic flux leakage becomes large. There was a problem that the efficiency of the transformer deteriorates.

The present invention has been made in order to solve such a problem, and it is possible to automatically mount a coil component used for a transformer or the like on a substrate, and further, to realize a low profile composite component. And a DC-DC converter using the same.

[0006]

In order to solve the above problems, the present invention provides a core having a collar at least at one end of a rod-shaped winding portion, and a winding wound around the winding portion of the core. And a substrate for mounting and fixing the coil component, and a locking means for locking the coil is provided on the substrate, and a winding shaft of a winding wire constituting the coil component. The coil component is locked and fixed to the substrate such that the coil component is vertical to the substrate.

The locking means is a recess provided in the substrate, and at least one of the flanges of the core is housed in the recess.

Further, the locking means is a through hole provided in the substrate, the flange of the core is locked in the through hole, and the coil component is locked and fixed to the substrate. .

Further, the locking means is a notch provided at an end portion of the board, the brim of the core is locked in the notch, and the coil component is locked and fixed to the board. Characterize.

Further, the collar is provided with an electrode for electrically connecting the core to the winding and the substrate, and an electrode for fixing the core to the substrate.

Further, the core and the substrate are made of a magnetic material.

Further, the present invention is characterized in that it is a DC-DC converter using the composite component according to any one of claims 1 to 6.

[0013]

According to the composite component of claim 1, since the coil component wound by winding the rod-shaped winding portion of the core is locked to the substrate by the locking means, the height of the composite component is It can be determined by the height of the core that constitutes the coil component and the thickness of the substrate.

According to the composite component of the second aspect, the recess serving as the locking means can be provided near the other element on the substrate to lock the coil component with the locking means.

According to the third aspect of the present invention, it is possible to lock the coil component to the locking means by providing the through hole, which is the locking means, near the other element on the substrate.

According to the composite component of claim 4, the coil component can be locked in the notch by inserting the winding portion from the notch opening which is the locking means provided on the substrate.

According to the composite component of claim 5, an electrode for electrically connecting the core to the winding and the substrate and for fixing the core to the substrate is provided on the flange of the core forming the coil component. Automatic soldering is possible by putting it in the solder reflow.

According to the composite component of claim 6, since the magnetic material is used for the core and the substrate, it is possible to form a closed magnetic circuit or a circuit with less magnetic flux leakage between the core and the substrate.

According to the DC-DC converter of the seventh aspect, it is possible to realize miniaturization and height reduction.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. In each of the embodiments, the same or equivalent parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

A first embodiment of the composite component according to the present invention will be described with reference to FIGS. 1 to 4. FIG. 1A and FIG.
2B is a top view and a side view of the composite part, FIGS. 2A and 2B are a top view and a side view of a substrate forming the composite part, and FIG. 3 is a coil forming the composite part. FIG. 4A and FIG. 4B are perspective views of the component, and are a top view and a side view of the coil component that constitutes the composite component.

In the composite component 10, the coil component 14 is the substrate 1
It is formed by being mounted on 1.

A method of mounting the coil component 14 on the substrate 11 will be described. The end surface 17a of the collar 16a is handled by an automatic vacuum suction mounting machine, the collar 16b is housed in the recess 15 of the substrate 11, the coil component 14 is housed and locked in the recess 15, and the electrode 19 provided on the collar 16b is then locked. The electrodes (not shown) on the substrate 11 are soldered to fix the coil component 14 to the substrate 11.

Reference numeral 11 denotes a rectangular parallelepiped substrate made of a magnetic material, and a member for locking a coil component 14 formed by winding a copper wire 13 having a fusible insulating film around a core 12 made of a magnetic material. A recess 15 is provided as a stopping means, and further, a transistor, a capacitor, an IC, a wiring and a resistor (not shown) having a DC-DC converting function on the surface.
Is installed or printed.

On the other hand, the core 12 which constitutes the coil component 14
At both ends of the rod-shaped winding part 121 of
16b is provided. And, one collar 16b is
It is made smaller than the opening of the recess 15 so that the recess 15 can be accommodated. In addition, the end surface 17b and the side surface 18b of the collar 16b
Is provided with an electrode 19 for electrically connecting the copper wire 13 and the core 12 and fixing the coil component 14 to the substrate 11. Furthermore, the end faces 17 of the collars 16a, 16b
The a and 17b are flat so that they can be handled by an automatic vacuum suction mounting machine.

Since the recess 15 provided in the substrate 11 is intended to lock the coil component 14, it may have any shape as long as the purpose can be achieved.

In this embodiment, the coil component 14 is mounted on the substrate 11
Since the recessed portion 15 for locking to can be provided in the vicinity of another element, for example, a transistor, a capacitor, an IC, etc., the wiring between the coil component 14 and the other element is shortened and loss due to wiring resistance is reduced. can do.

The collar 1 provided on the other end of the core 12
Since 6b is housed in the recess 15 and the coil component 14 is locked in the recess 15, the coil component 14 can be automatically mounted on the substrate 11.

Furthermore, since the coil component 14 is locked in the recess 15 provided in the substrate 11, soldering by reflow is possible.

Further, since the coil component 14 is fixed to the recess 15 provided in the substrate 11 by soldering, the composite component 10
Is determined by the height of the core 12 and the thickness obtained by subtracting the depth of the recess 15 from the thickness of the substrate 11. Therefore, by reducing the height of the core 12, it is possible to reduce the height of the composite component 10.

Further, since the height of the core 12 is reduced, the leakage magnetic flux is reduced and the coil component 14 having high inductance can be realized.

Further, since the magnetic material is used for the substrate 11 and the core 12, the substrate 11 and the coil component 14 can form a closed magnetic circuit or a circuit with less magnetic flux leakage. Therefore, the leakage magnetic flux is reduced and the loss can be suppressed.

Further, when the coil component 14 is applied to the transformer of the DC-DC converter to form the composite component 10,
The DC-DC converter can be reduced in height, and the set product can be downsized and reduced in height.

A second embodiment of the composite component according to the present invention will be described with reference to FIGS. FIG. 5 (a) and FIG.
6B is a top view and a side view of the composite component, FIGS. 6A and 6B are a top view and a side view of a substrate forming the composite component, and FIG. 7 is a coil forming the composite component. 8A and 8B are a top view and a side view of a coil component forming a composite component.

In the composite component 20, the coil component 23 is the substrate 2
It is formed by being mounted on 1.

A method of mounting the coil component 23 on the substrate 21 will be described. The end face 26a of the collar 25a is handled by an automatic vacuum suction mounting machine, the collar 25b is passed through the through hole 24, the coil component 23 is locked in the through hole 24, and then the collar 2 is pressed.
The electrode 19 provided on 5 a and an electrode (not shown) on the substrate 21 are soldered to fix the coil component 23 to the substrate 21.

Reference numeral 21 is a rectangular parallelepiped substrate made of a magnetic material, and a through hole 24 is provided as a locking means for locking a coil component 23 formed by winding the copper wire 13 around a core 22 made of a magnetic material. DC-DC provided on the surface
Transistor, capacitor, I for having conversion function
C, wiring, and resistors (not shown) are mounted or printed.

On the other hand, the core 22 which constitutes the coil component 23
At both ends of the rod-shaped winding portion 221 of
25b are provided. And, one collar 25a is
The coil component 23 is larger than the through hole 24 so that the coil component 23 can be caught on the substrate 21, and the collar 25b is smaller than the through hole 24 so as to pass through the through hole 24. Further, an electrode 19 for electrically connecting the copper wire 13 and the core 22 and fixing the coil component 23 to the substrate 21 is provided on the end surface 26a and the side surface 27a of the collar 25a. Further, similarly to the first embodiment, the end surfaces 26a, 26 of the collars 25a, 25b are
b is flat so that it can be handled by an automatic vacuum suction mounting machine.

Since the through hole 24 provided in the substrate 21 is for the purpose of locking the coil component 23, it may have any shape as long as the purpose can be achieved.

In the present embodiment, in addition to the effect obtained in the first embodiment, since the coil component 23 is locked in the through hole 24 provided in the substrate 21, soldering by reflow is possible.

Further, since the coil component 23 is inserted into the through hole 24 formed in the substrate 21, the height of the composite component 20 is determined only by the height of the core 22. Therefore, core 2
By reducing the height of 2, the composite component 20 is further reduced in height.

A third embodiment of the composite component according to the present invention will be described with reference to FIGS. 9 (a) and 9
10B is a top view and a side view of the composite component, FIG.
10A and 10B are a top view and a side view of a substrate forming the composite component, FIG. 11 is a perspective view of a coil component forming the composite component, and FIGS. 12A and 12B are composite views. It is a top view and a side view of a coil component which constitutes a component.

In the composite component 30, the coil component 33 is the substrate 3
It is formed by being mounted on 1.

A method of mounting the coil component 33 on the substrate 31 will be described. The end surface 39a of the collar 38a is handled by an automatic vacuum suction mounting machine, and the core 3 of the coil component 33 is handled.
The rod-shaped winding portion 321 of No. 2 is fitted into the notch 34 through the opening of the notch 34. Next, after locking the collar 38a in the notch 34, the electrode 19 provided on the collar 38a and the electrode (not shown) on the substrate 31 are soldered by reflow to fix the coil component 33 to the substrate 31. To do.

Reference numeral 31 denotes a rectangular parallelepiped substrate made of a magnetic material, and a notch 34 as a locking means for locking a coil component 33 formed by winding the copper wire 13 around a core 32 made of a magnetic material. DC-D provided on the surface
A transistor 35 having a C conversion function, a capacitor 36, and an IC 37 are mounted, and wiring and resistors (not shown) are printed.

On the other hand, the core 32 constituting the coil component 33
Collars 38 a and 38 b are provided at both ends of the rod-shaped winding portion 321. The one flange 38a is larger than the notch 34 so that the coil component 33 can be locked in the notch 34 provided on the substrate 31. Further, an electrode 19 for electrically connecting the copper wire 13 and the core 32 and fixing the coil component 33 to the substrate 31 is provided on the end surface 39a and the side surface 40a of the collar 38a. Further, similarly to the first embodiment, the end faces 3 of the collars 38a, 38b are
9a and 39b are flat so that they can be handled by an automatic vacuum suction mounting machine.

If the other flange 38b is smaller than the notch 34, the flange 38b may be inserted into the notch 34 from above the substrate 31 and the flange 38a may be locked in the notch 34.

Since the notch 34 provided on the substrate 31 is intended to lock the coil component 33, any shape is possible as long as the purpose can be achieved.

In this embodiment, the rod-shaped winding portion 321 of the core 32 of the coil component 33 is opened from the opening of the notch 34, or the rod-shaped winding portion 32 of the core 32 is arranged from above the substrate 31.
In order to insert the brim 38b provided at the other end of 1 into the notch 34 and lock the coil component 33 in the notch 34,
The coil component 33 can be automatically mounted on the substrate 31.

The rod-shaped winding portion 321 of the core 32 of the coil component 33 is cut out from the opening of the cutout 34.
4, the coil component 33 can be locked in the notch 34 provided in the substrate 31,
Collars 38 provided at both ends of the rod-shaped winding portion 321 of the core 32.
The a and 38b can have the same shape.

Further, since the coil component 33 is locked in the notch 34 provided on the substrate 31, soldering by reflow is possible.

Further, since the coil component 33 is fixed to the notch 34 provided on the substrate 31, the height of the composite component 30 is determined only by the height of the core 32. Therefore, by reducing the height of the core 32, the height of the composite component 30 is further reduced.

Further, since the height of the core 32 is reduced, the leakage magnetic flux is reduced and the coil component 33 having high inductance can be realized.

Further, since a magnetic material is used for the substrate 31 and the core 32, the substrate 31 and the coil component 33 are
A closed magnetic circuit can be formed. Therefore, the leakage magnetic flux is reduced and the loss can be suppressed.

In addition, the composite component 30, that is, DC-D
The C converter can be reduced in height, and the set product can be downsized and reduced in height.

[0056]

According to the composite component of the first aspect, since the coil component in which the winding is wound around the rod-shaped winding portion of the core is locked to the substrate by the locking means, the height of the composite component is increased. Can be determined by the height of the core that constitutes the coil component and the thickness of the substrate.

In order to lock the coil part to the locking means by handling the end face of the brim provided at one end of the rod-shaped winding part of the core forming the coil part by an automatic vacuum suction mounting machine. The coil component can be automatically mounted on the board.

According to the composite component of the second aspect, since the recess for locking the coil component to the substrate can be provided in the vicinity of the other element constituting the composite component, the coil component and the other element can be separated from each other. The wiring is shortened and the loss due to wiring resistance can be reduced.

Further, since the coil component is fixed in the recess provided in the substrate, the height of the composite component is determined by the height of the core and the thickness obtained by subtracting the depth of the recess from the thickness of the substrate. Therefore, by reducing the height of the core, it is possible to reduce the height of the composite component.

Furthermore, since the height of the core is reduced, leakage magnetic flux is reduced, and a coil component having high inductance can be realized.

According to the composite component of claim 3, since the coil component is fixed to the through hole for locking the substrate, the height of the composite component is determined only by the height of the core. Therefore, by reducing the height of the core, the height of the composite component is further reduced.

According to the composite component of claim 4, by inserting the rod-shaped winding portion of the core of the coil component into the notch through the notch opening, the coil component is cut into the notch provided on the substrate. Since they can be locked, the two flanges provided at both ends of the rod-shaped winding portion of the core that constitutes the coil component can have the same shape.

Since the coil component is fixed to the notch provided on the substrate, the height of the composite component is determined only by the height of the core. Therefore, by reducing the height of the core, the height of the composite component is further reduced.

According to the composite component of claim 5, the collar of the core forming the coil component is provided with an electrode for electrically connecting the core to the winding and the substrate and for fixing the core to the substrate. Automatic soldering is possible by putting it in the solder reflow.

According to the composite component of claim 6, since the magnetic material is used for the substrate and the core, a closed magnetic circuit and a circuit with less magnetic flux leakage can be formed by the substrate and the coil component. Therefore, the leakage magnetic flux is reduced and the loss can be suppressed.

According to the DC-DC converter of the seventh aspect, downsizing and height reduction can be realized.

[Brief description of drawings]

FIG. 1 (a) of a composite component according to a first embodiment of the present invention
Is a top view, and (b) is a side view.

FIG. 2A is a top view and FIG. 2B is a side view of a substrate constituting the composite component of the first embodiment according to the present invention.

FIG. 3 is a perspective view of a coil component forming the composite component of the first embodiment according to the present invention.

FIG. 4A is a top view and FIG. 4B is a side view of a coil component forming the composite component of the first embodiment according to the present invention.

FIG. 5 (a) of the composite component of the second embodiment according to the present invention
Is a top view and (b) is a side view.

FIG. 6A is a top view and FIG. 6B is a side view of a substrate constituting a composite component of a second embodiment according to the present invention.

FIG. 7 is a perspective view of a coil component that constitutes a composite component according to a second embodiment of the present invention.

FIG. 8A is a top view and FIG. 8B is a side view of a coil component that constitutes a composite component according to a second embodiment of the present invention.

FIG. 9 (a) of the composite component of the third embodiment according to the present invention
Is a top view and (b) is a side view.

FIG. 10A is a top view and FIG. 10B is a side view of a substrate constituting a composite component of a third embodiment according to the present invention.

FIG. 11 is a perspective view of a coil component that constitutes a composite component according to a third embodiment of the present invention.

12 (a) is a top view and FIG. 12 (b) is a side view of a coil part that constitutes a composite part of a third example according to the present invention.

FIG. 13 is a side view showing a conventional composite component.

[Explanation of symbols]

10, 20, 30 Composite part 11, 21, 31 Substrate 12, 22, 32 Core 13 Winding 121, 221, 321 Winding part 14, 23, 33 Coil part 15 Recess 16a, 16b, 25a, 25b, 38a, 38b
Tsuba 19 Electrode 24 Through hole 34 Notch

Claims (7)

[Claims] 1. A coil component including a core having a collar at least at one end of a rod-shaped winding portion, a winding wound around the winding portion of the core, and a substrate for mounting and fixing the coil component. And a locking means for locking the coil on the substrate, wherein the coil component is arranged such that a winding axis of a coil forming the coil component is perpendicular to the substrate. A composite part that is locked and fixed to a substrate. 2. The composite component according to claim 1, wherein the locking means is a recess provided in the substrate, and at least one of the flanges of the core is housed in the recess. 3. The locking means is a through hole provided in the board, the flange of the core is locked in the through hole, and the coil component is locked and fixed to the board. The composite component according to claim 1. 4. The locking means is a notch provided in an end portion of the board, the flange of the core is locked in the notch, and the coil component is locked and fixed to the board. The composite part according to claim 1, characterized in that 5. The collar is provided with an electrode for electrically connecting the core to the winding and the substrate, and an electrode for fixing the core to the substrate. The composite component according to any one of claims 1 to 4. 6. The composite component according to claim 1, wherein the core and the substrate are made of a magnetic material. 7. A DC-DC converter using the composite component according to any one of claims 1 to 6.